When you say “cut and paste” – do you mean using the lasso?
I suspect both of your issues to be about the lasso. You see, because of our line engine (which is great in so many ways), it has this limitation, that if you “overuse” the lasso – i.e. copies a lot of parts in the same drawing, it will eventually build up the data and therefore slow down the software. I believe you must have gotten a warning about it in AP? As it says in that window, the remedy is to trace over your drawing on a blank sheet and delete the old one.
However, as we speak, we are actually working on a better general solution. Hopefully this will be part of the next update.
Please let me know if it really was the lasso/stamp thing you meant? 😉